CN108206330B - System and method for mitigating radio frequency interference from adjacent antennas - Google Patents
System and method for mitigating radio frequency interference from adjacent antennas Download PDFInfo
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- CN108206330B CN108206330B CN201711097849.5A CN201711097849A CN108206330B CN 108206330 B CN108206330 B CN 108206330B CN 201711097849 A CN201711097849 A CN 201711097849A CN 108206330 B CN108206330 B CN 108206330B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
- H01Q1/523—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas between antennas of an array
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
- H01Q21/065—Patch antenna array
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/2605—Array of radiating elements provided with a feedback control over the element weights, e.g. adaptive arrays
- H01Q3/2611—Means for null steering; Adaptive interference nulling
- H01Q3/2629—Combination of a main antenna unit with an auxiliary antenna unit
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
- H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
- H04B1/126—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means having multiple inputs, e.g. auxiliary antenna for receiving interfering signal
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Abstract
The present invention relates to systems and methods for mitigating radio frequency interference from adjacent antennas. A system for mitigating radio frequency interference includes a multi-patch antenna array including a plurality of patch antenna components. The multi-patch antenna array is positioned relative to the interfering antenna such that signals from the interfering antenna cause interference to the multi-patch antenna array. The system also includes an auxiliary antenna positioned relative to the multi-patch antenna array. The system additionally includes means for generating spatial nulls in a direction from the multi-patch antenna array to the interfering antenna in response to the first signal from the auxiliary antenna and the second signal from the multi-patch antenna array. The first and second signals are generated in response to a transmit signal received through the auxiliary antenna and the multi-patch antenna array. The spatial nulls allow the multi-patch antenna array and the interfering antenna to operate simultaneously.
Description
Technical Field
The present disclosure relates to antennas, and more particularly, to adjacent antenna interference mitigation.
Background
In some cases, interference problems may make it difficult or even impossible for a satellite transceiver or system to operate simultaneously with an on-board communications system. When two communication systems have spectrum allocations directly adjacent to each other and there is no guard band between the operating spectra of the two systems, the operation of one system may interfere with the operation of the other system. There are three possible interference mechanisms that should be considered. First are spurious harmonics and out-of-band transmission. Second, very high power signals may overload the receiver front-end, preventing reception of the desired signal. Finally, some systems may operate on multiple carriers. These multiple carriers may produce intermodulation products that fall directly into the relevant frequency band, thereby interfering with signal reception. Because there is no guard band between the operating frequencies of the system and some interference mechanisms involve signals that are clearly unwanted, conventional frequency filtering methods are inadequate and interference is sometimes unavoidable. Thus, the only way to deal with interference is to ensure that the systems are not used simultaneously. Such a solution is not acceptable but requires that both systems be able to operate simultaneously.
Disclosure of Invention
According to an embodiment, a system for mitigating Radio Frequency (RF) interference from neighboring antennas includes a multi-patch antenna array including a plurality of patch antenna elements. The multi-patch antenna array is positioned relative to an interfering antenna such that RF transmit signals from the interfering antenna cause interference to RF signals received by the multi-patch antenna array. The system also includes an auxiliary antenna positioned relative to the multi-patch antenna array. The system additionally includes means for generating a spatial null in a direction from the multi-patch antenna array to the interfering antenna in response to the first signal from the auxiliary antenna and the second signal from the multi-patch antenna array. The first and second signals are generated in response to a transmit signal received through the auxiliary antenna and the multi-patch antenna array. The spatial nulls allow the multi-patch antenna array and the interfering antenna to operate simultaneously.
In accordance with another embodiment, a system for mitigating RF interference from an adjacent antenna includes a first transceiver on a vehicle. The first transceiver is configured to transmit and receive RF signals over a first communication system operating in a first frequency band. The system also includes an interfering antenna coupled to the first transceiver for transmitting and receiving the RF signals. The system additionally includes a second transceiver on the vehicle. The second transceiver is configured to transmit and receive RF signals through a second communication system operating in a second frequency band adjacent to the first frequency band, and no guard frequencies are between the first frequency band and the second frequency band. The system also includes a multi-patch antenna array coupled to the second transceiver. The multi-patch antenna array includes a plurality of patch antenna components. The multi-patch antenna array is positioned proximate to the interfering antenna such that the RF transmit signal from the interfering antenna interferes with the reception of the RF signal by the multi-patch antenna array. The system additionally includes an auxiliary antenna located between and proximate to the multi-patch antenna array and the interfering antenna. The system also includes means for generating spatial nulls in a direction from the multi-patch antenna array to the interfering antenna in response to the first signal from the auxiliary antenna and the second signal from the multi-patch antenna array. The first and second signals are generated in response to a transmit signal received through the auxiliary antenna and the multi-patch antenna array. The spatial nulls allow the multi-patch antenna array and the interfering antenna to operate simultaneously.
According to another embodiment, a method for mitigating RF interference from neighboring antennas, the method comprising: a first signal is received from an auxiliary antenna and a second signal is received from a multi-patch antenna array. The multi-patch antenna array includes a plurality of patch antenna components. The multi-patch antenna array is positioned relative to an interfering antenna such that RF transmit signals from the interfering antenna cause interference to RF signals received by the multi-patch antenna array. The method further comprises the steps of: generating a spatial null in a direction from the multi-patch antenna array to the interfering antenna in response to the first signal and the second signal. The first and second signals are generated in response to a transmit signal received through the auxiliary antenna and the multi-patch antenna array. The spatial nulls allow the multi-patch antenna array and the interfering antenna to operate simultaneously.
According to another embodiment or any of the previous embodiments, the method further comprises the steps of: determining an amplitude adjustment and a phase factor adjustment to provide cancellation of the RF transmit signal from the interfering antenna in the direction from the multi-patch antenna array to the interfering antenna. The method additionally comprises the steps of: applying the amplitude adjustment and the phase factor adjustment to the first signal from the auxiliary antenna to provide a cancellation signal that generates a spatial null in a direction from the multi-patch antenna array to the interfering antenna.
According to another embodiment or any of the previous embodiments, the method further comprises the steps of: amplifying the first signal from the auxiliary antenna to a predetermined magnitude to cancel the RF transmit signal in the direction of the interfering antenna without reducing the magnitude of the electromagnetic radiation pattern of the multi-patch antenna array in other directions from the multi-patch antenna array.
In accordance with another embodiment or any preceding embodiment, the means for generating a spatial null in a direction from the multi-patch antenna array to the interfering antenna is configured to determine an amplitude adjustment and a phase factor adjustment to provide cancellation of the RF transmit signal from the interfering antenna in the direction from the multi-patch antenna array to the interfering antenna.
In accordance with another embodiment or any preceding embodiment, the amplitude adjustment and the phase factor adjustment are applied to the first signal from the auxiliary antenna to provide a cancellation signal that generates a spatial null in a direction from the multi-patch antenna array to the interfering antenna.
In accordance with another embodiment or any preceding embodiment, the first signal from the auxiliary antenna is amplified to a predetermined magnitude to cancel the RF transmit signal in a direction from the multi-patch antenna array to the interfering antenna without reducing a magnitude of an electromagnetic radiation pattern of the multi-patch antenna array in other directions from the multi-patch antenna array.
In accordance with another embodiment or any of the previous embodiments, the auxiliary antenna comprises a monopole antenna.
In accordance with another embodiment or any of the previous embodiments, the monopole antenna is located approximately one wavelength from a center of the multi-patch antenna array.
In accordance with another embodiment or any of the previous embodiments, wherein the height of the monopole antenna is selected such that a response of the monopole antenna to a radiated electromagnetic field from the jammer antenna approximately matches a response of the multi-patch antenna array to the radiated electromagnetic field of the jammer antenna.
In accordance with another embodiment or any preceding embodiment, the multi-patch antenna array comprises at least two patch antenna elements.
In accordance with another embodiment or any preceding embodiment, the multi-patch antenna array comprises four patch antenna elements.
In accordance with another embodiment or any of the previous embodiments, the patch antenna components are linearly positioned with respect to each other and the auxiliary antenna.
In accordance with another embodiment or any of the previous embodiments, each patch antenna element is square and the multi-patch antenna array provides circular polarization.
According to another embodiment or any preceding embodiment, the means for generating the spatial zero values comprises: a first band pass filter receiving the first signal from the auxiliary antenna, and a summing junction (summing junction) for combining signals from each of the patch antenna elements of the multi-patch antenna array to form the second signal. The apparatus also includes a second band pass filter that receives the second signal from the multi-patch antenna array. The apparatus additionally includes a local oscillator. A first output signal from the first band pass filter is mixed with a reference signal from the local oscillator to provide a first mixed signal, and a second output signal from the second band pass filter is mixed with another reference signal from the local oscillator to provide a second mixed signal. The apparatus additionally includes a first analog-to-digital converter (ADC) to digitize the first mixed signal and a second ADC to digitize the second mixed signal. The apparatus also includes a digital signal processor that combines the digitized first mixed signal and the digitized second mixed signal to provide the spatial nulls in a direction from the patch antenna array to the jammer antenna.
In accordance with another embodiment or any preceding embodiment, the interfering antenna transmits the RF transmit signal in a first frequency band and the multi-patch antenna array transmits and receives other RF transmit signals in a second frequency band adjacent to the first frequency band, there being no guard band between the first frequency band and the second frequency band.
Drawings
Fig. 1 is an illustration of an interfering antenna causing Radio Frequency (RF) interference to adjacent victim antenna received RF signals.
Fig. 2 is a schematic block diagram of an example of a system for mitigating RF interference from neighboring antennas in accordance with an embodiment of the present disclosure.
Fig. 3 is a polar coordinate system illustrating an example of determining a cancellation signal to generate spatial nulls in the direction of an interfering antenna.
Fig. 4A is an exemplary radiation pattern illustrating spatial nulls with respect to elevation (elevation) for a monopole antenna and multi-patch antenna array combination according to an embodiment of the present disclosure.
Fig. 4B is an exemplary radiation pattern illustrating spatial nulls with respect to azimuth (azimuth) for a monopole antenna and multi-patch antenna array combination according to an embodiment of the present disclosure.
Fig. 5 is a perspective view of an example of a monopole antenna and a multi-patch antenna array for mitigating RF interference from neighboring antennas, according to an embodiment of the present disclosure.
Fig. 6 is a detailed top view of a patch antenna assembly of the multi-patch antenna array of fig. 3 according to an embodiment of the present disclosure.
Fig. 7 is a schematic block diagram of an example of a system for mitigating interference from neighboring antennas in accordance with an embodiment of the present disclosure.
Fig. 8 is a flow chart of an example of a method for mitigating interference from neighboring antennas in accordance with an embodiment of the present disclosure.
Detailed Description
The following detailed description of embodiments refers to the accompanying drawings, which illustrate specific embodiments of the disclosure. Other embodiments having different structures and operations do not depart from the scope of the present disclosure. The same reference numbers may refer to the same components or assemblies in different figures.
Fig. 1 is an example of a communication system 100 illustrating that an interfering antenna 102 causes Radio Frequency (RF) interference 104 to adjacent victim antennas 108 receiving RF signals 106. The jamming antenna 102 is communicatively or electrically connected to a first transceiver 110 for communicating over a first satellite communication system 112, system a, or a first communication network utilizing the jamming antenna 102. The adjacent victim antenna 108 is communicatively connected to a second transceiver 114 configured for communication over a second satellite communication system 116, system B, or a second communication network. According to an embodiment, the interfering antenna 102 and the adjacent victim antenna 108 are located close to each other on a vehicle 118 (e.g. an airplane). In other embodiments, the interfering antenna 102 and the associated first transceiver 110 and the adjacent victim antenna 108 and the associated second transceiver 114 are located on other types of vehicles (such as watercraft or ground vehicles), or the interfering antenna 102 and the adjacent victim antenna 108 and the associated transceivers are located on a fixed geo-location platform.
According to an embodiment, the first transceiver 110 may be an Inmarsat (international maritime satellite communication organization) transceiver and the first satellite communication system 112 or network is an international maritime satellite communication organization satellite communication system or network that includes a first constellation of satellites 120. The second transceiver 114 may be an iridium (iridium) transceiver and the second satellite communication system 116 or network is an iridium satellite communication system or network that includes a second constellation of satellites 122. Transmitting signals through the Inmarsat transceiver or first transceiver 110 with interfering antenna 102 interferes with transmitting or receiving RF signals through the iridium transceiver or with adjacent victim antenna 108. The Inmarsat transceiver or first transceiver 110 is also configured to transmit and receive RF signals 124 from a first set of communication devices 126. The iridium satellite transceiver or second transceiver 114 is also configured to transmit and receive RF signals 128 from a second set of communication devices 130. The first set of communication devices 126 is configured for communication using the Inmarsat satellite communication system. The second set of communication devices 130 is configured for communication using an Iridium satellite communication system. In other embodiments, the first set of communication devices 126 and the second set of communication devices 130 are configured to communicate using the Inmarsat satellite communication system or the iridium satellite communication system. Examples of first set of communication devices 126 and second set of communication devices 130 include, but are not limited to, mobile communication devices (such as mobile phones, smart phones, and computer devices), and vehicle or aircraft communication devices operating with at least one of the Inmarsat satellite communication system or the iridium satellite communication system.
Fig. 2 is a schematic block diagram of an example of a communication system 200 including a system 202 for mitigating RF interference from adjacent antennas 204 in accordance with an embodiment of the present disclosure. Communication system 200 is similar to communication system 100 of fig. 1, except that communication system 200 includes a system 202 for mitigating RF interference from adjacent antennas 204. Adjacent antenna 204 is the same as interfering antenna 102. System 202 includes a multi-patch antenna array 206 having a plurality of patch antenna assemblies 208. The multi-patch antenna array 206 is positioned relative to or near the interfering antenna 102 or adjacent antenna 204 such that RF transmit signals 210 transmitted through the interfering antenna 102 cause RF interference 104 (fig. 1) to other RF signals 212 received through the multi-patch antenna array 206. The jamming antenna 102 is communicatively or electrically connected to a first transceiver 110 for communicating over a first satellite communication system 112, system a, or a first communication network utilizing the jamming antenna 102. The interfering antenna 102 transmits RF transmit signals 210 in a first frequency band, while the multi-patch antenna array 206 transmits and receives other RF transmit signals 212 in a second frequency band adjacent to the first frequency band, and there is no guard band between the first frequency band and the second frequency band. An example of a multi-patch antenna array 504 that may be used for the multi-patch antenna array 206 is described in more detail with reference to fig. 3.
The system 202 also includes an auxiliary antenna 214 that is positioned relative to the multi-patch antenna array 206. According to an embodiment, the auxiliary antenna 214 is a monopole antenna. The auxiliary antenna 214 or monopole antenna is positioned approximately one wavelength from the center 215 of the multi-patch antenna array 206 to prevent electromagnetic coupling between the auxiliary antenna 214 and the multi-patch antenna array 206. The height of the auxiliary antenna 214 or monopole antenna is selected such that the response of the auxiliary antenna 214 to the radiated electromagnetic field 227 or RF transmit signal 210 from the interfering antenna 102 approximately matches the response of the multi-patch antenna array 206 to the radiated electromagnetic field 227 or RF transmit signal 210 from the interfering antenna 102. The auxiliary antenna 214 has a lower gain than the gain of the multi-patch antenna array 206 to prevent the auxiliary antenna 214 from affecting the radiation pattern or radiated electromagnetic field 228 of the multi-patch antenna array 206. The auxiliary antenna 214 may have a radiated electromagnetic field 230.
The communication system 200 additionally includes a means 216 for generating spatial nulls 218 in a direction (indicated by arrow 220) from the multi-patch antenna array 206 to the interfering antenna 102 in response to a first signal 222 from the auxiliary antenna 214 and a second signal 224 from the multi-patch antenna array 206. The means 216 for generating spatial nulls 218 in a direction 220 towards the interfering antenna 102 is electrically connected to the multi-patch antenna array 206 and the auxiliary antenna 214. Referring to FIG. 7, an example of an apparatus 701 used for the apparatus 216 for generating spatial zeros 218 is described in more detail. The first signal 222 and the second signal 224 are generated in response to a transmitted RF signal 226 or a radiated electromagnetic field 227 received by the auxiliary antenna 214 and the multi-patch antenna array 206. The second signal 224 also corresponds to the response of the multi-patch antenna array 206 to the radiated electromagnetic field 227 from the interfering antenna 102. According to an embodiment, the transmitted RF signal 226 is transmitted through the second satellite communication device 116. In other embodiments, the transmitted RF signal 226 is transmitted through the interfering antenna 102, the first satellite communication device 112, or another source.
As described in more detail with reference to fig. 4A and 4B, the spatial nulls are ineffective in the electromagnetic radiation pattern of the auxiliary antenna 214 and the multi-patch antenna array 206 where the received or transmitted electromagnetic energy is approximately near zero or at a minimum decibel level such that no electromagnetic energy or no detectable amount of electromagnetic energy or no RF signal is received in that particular direction. Spatial nulls 218 allow simultaneous operation of multi-patch antenna array 206 and interfering antenna 102. Thus, simultaneous communications are available with respect to the first satellite communication system 112 or the Inmarsat satellite communication system, and the second satellite communication system 116 or the Iridium satellite communication system. According to an embodiment, the first satellite communication system operates in a frequency band adjacent to a frequency band in which the second satellite communication system operates, and there is no guard band or frequency space between the two adjacent frequency bands. Thus, simultaneous operation of the first satellite communication system with the second satellite communication system results in interference of the first satellite communication system with the second satellite communication system. Additionally, according to an embodiment, the first satellite communication system operates at a higher power than the second satellite communication system. According to another embodiment, system 202 is used to simultaneously communicate with a different communication system that is a terrestrial-based or ground-based communication system, or one communication system is a satellite communication system and the other system is a ground-based communication system, where system 202 mitigates RF interference from interfering antenna 102 or adjacent antenna 204.
Fig. 3 illustrates an exemplary polar coordinate system 300 for determining a cancellation signal 314 to generate spatial nulls 218 in the direction 220 from the multi-patch antenna array 206 to the interfering antenna 102. The apparatus 216 is configured to determine an amplitude 302 and a phase factor theta (theta)304 of the response of the multi-patch antenna array 206 to the radiated electromagnetic field 227 or RF transmit signal 210 from the jammer antenna 102 to generate spatial nulls 218 by the apparatus 216 in a direction 220 toward the jammer antenna 102. The amplitude 302 and phase factor θ 304 are represented by the length or radius and angle of the vector 306 in the polar coordinate system 300. The magnitude 302 and phase or phase factor θ 304 of the response of the multi-patch antenna array 206 to the radiated electromagnetic field 227 from the direction 220 of the interfering antenna 102 is used to provide cancellation of the RF transmit signal 210 from the interfering antenna 102. The response of the multi-patch antenna array 206 to the radiated electromagnetic field 227 or RF transmit signal 210 from the interfering antenna 102 is also represented by vector 306. Cancellation of RF transmit signal 210 from interfering antenna 102 defines spatial nulls 218 in a direction 220 from multi-patch antenna array 206 to interfering antenna 102.
The apparatus 216 is further configured to determine an amplitude 308 and a phase factor α (alpha)310 of a response of the auxiliary antenna 214 or monopole antenna to the radiated electromagnetic field 227 relative to the direction 220 from the auxiliary antenna 214 and multi-patch antenna array 206 to the interfering antenna 102. The amplitude 308 and phase factor a 310 of the response of the auxiliary antenna 214 to the radiated electromagnetic field 227 or RF transmit signal 210 from the direction 220 of the interfering antenna 102 represent the system 300 by the length or radius of the vector 312 in polar coordinates. The response of the auxiliary antenna 214 or monopole antenna to the radiated electromagnetic field 227 or RF transmit signal 210 from the interfering antenna is also represented by vector 312. The height of the auxiliary antenna 214 or monopole antenna is selected such that the magnitude 308 of the response of the auxiliary antenna 214 to the radiated electromagnetic field 227 or RF transmit signal 210 from the interfering antenna 102 approximately matches the magnitude 302 of the response of the multi-patch antenna array 206 to the radiated electromagnetic field 227 or RF transmit signal 210 relative to the direction 220 from the multi-patch antenna array 206 to the interfering antenna 102. The cancellation signal 314 (represented by a vector in fig. 3) in the direction 220 of the interfering antenna 102 will have a phase factor such that the phase factor 314 is 180 degrees out of phase with the phase factor 304 of the response of the multi-patch antenna array 206 to the radiated electromagnetic field 227 relative to the direction 220 from the multi-patch antenna array 206 to the interfering antenna 102. The cancellation signal 314 also has an amplitude 316 represented by the length or radius of the cancellation signal 314 vector that cancels the amplitude 302 of the response of the multi-patch antenna array 206 to the radiated electromagnetic field 227 from the interfering antenna 102 from the cancellation angle or direction 220 relative to the interfering antenna 102. The amplitude 308 and phase factor a 310 of the auxiliary antenna 214 or monopole antenna are adjusted or corrected to provide a cancellation signal 314 that generates the spatial null 218 in the direction 220 of the multi-patch antenna array 206. Wherein the means 216 is configured to determine an amplitude adjustment (318) and a phase factor adjustment Φ (phi)320 for providing a cancellation signal 314 that causes cancellation of the RF transmit signal 210 from the interfering antenna 102 in a direction 220 from the multi-patch antenna array 206 to the interfering antenna 102. Amplitude adjustment 318 and phase factor adjustment Φ 320 are applied to first signal 222 from auxiliary antenna 214, represented by vector 312, to provide cancellation signal 314 that generates spatial null 218 in direction 220 from the multi-patch antenna array to interfering antenna 102.
Fig. 4A is an exemplary radiation pattern 400 illustrating spatial nulls 402 with respect to the elevation of the auxiliary antenna 214 and multi-patch antenna array 206 combination, according to an embodiment of the present disclosure. Fig. 4B is an exemplary radiation pattern 404 illustrating spatial nulls 402 in azimuth for the auxiliary antenna 214 and multi-patch antenna array 206 combination according to an embodiment of the disclosure. As previously described, the spatial nulls 402 are in the direction 220 from the multi-patch antenna array 206 to the interfering antenna 102. Spatial zero values 402 are created based on the process described with reference to FIG. 3. Thus, the RF transmit signal 210 from the interfering antenna 102 is cancelled in the direction from the multi-patch antenna array 206 to the spatial null 402. This allows the multi-patch antenna array 206 to receive or transmit RF signals in other directions with respect to the electromagnetic radiation patterns 402 and 404, allowing simultaneous operation of the multi-patch antenna array 206 and the interfering antenna 102.
Fig. 5 is a perspective view of an example of an auxiliary antenna 502 and a multi-patch antenna array 504 for mitigating RF interference from adjacent antennas, such as adjacent antenna 204 or interfering antenna 102, in accordance with an embodiment of the present disclosure. In the example of fig. 5, the auxiliary antenna 502 is a monopole antenna. According to an embodiment, an auxiliary antenna 502 is used for the auxiliary antenna 214 and a multi-patch antenna array 504 is used for the multi-patch antenna array 206 in fig. 2. In the exemplary embodiment of fig. 5, the multi-patch antenna array 504 includes four patch antenna elements. In other embodiments, the multi-patch antenna array 504 includes at least two patch antenna elements 506, while in other embodiments, the multi-patch antenna array 504 includes more than four patch antenna elements 506, depending on the gain requirements and the size of the area 508 (e.g., a panel or portion of the fuselage of the aircraft) for locating the multi-patch antenna array 504 and the auxiliary antenna 502.
In the exemplary embodiment of fig. 5, the patch antenna components 506 are linearly positioned with respect to each other and the auxiliary antenna 502. In other embodiments, the patch antenna assembly 506 is located in a planar array opposite the auxiliary antenna 502, or the multi-patch antenna array 504 is rotated 90 degrees with respect to the auxiliary antenna 502 as shown in fig. 5. Each patch antenna element 506 is square or has a square shape to provide circular polarization. The multi-patch antenna array 504 provides circular polarization. The auxiliary antenna 502 is spaced apart from the center 510 of the multi-patch antenna array 504 by approximately one wavelength to prevent electromagnetic coupling between the auxiliary antenna 502 and the multi-patch antenna array 506.
According to an embodiment, the multi-patch antenna array 504 is formed on a ground plane 512. The ground plane 512 is a conductive or semiconductor material. Referring also to fig. 6, fig. 6 is a detailed top view of the patch antenna components 506 of the multi-patch antenna array 504 of fig. 5, according to an embodiment of the present disclosure. Each patch antenna component 506 includes a sheet 514 of dielectric material disposed above a ground plane 512. Each sheet 514 of dielectric material is formed as a square. Each patch antenna component 506 also includes a patch 516 of conductive or semiconductor material disposed on the sheet 514 of dielectric material. Each patch 516 is formed as a square. The edge 518 of each patch 516 is shorter than the edge 520 of each sheet 514 of dielectric material, and each patch 516 is concentrically disposed on the associated sheet 514 of dielectric material. Thus, the sheet 514 of dielectric material defines a boundary 522 of equal width "W" around the perimeter of the patch antenna component 506. Each patch antenna assembly 506 also includes an X-direction feed 524 and a Y-direction feed 526 formed in the patch 516 to provide circular polarization of any RF signals transmitted by the patch antenna assemblies 506.
Fig. 7 is a schematic block diagram of an example of a system 700 for mitigating interference from neighboring antennas in accordance with an embodiment of the present disclosure. According to an embodiment, the system 700 is used for the system 202 of fig. 2. The system 700 includes an apparatus 701 for generating spatial zeros according to an embodiment of the present disclosure. The apparatus 701 is used for the apparatus 216 in fig. 2. The first signal 222 from the auxiliary antenna 214 is amplified by the amplifier 702 to a predetermined magnitude to cancel the RF transmit signal 210 in the direction 202 from the multi-patch antenna array 206 to the interfering antenna 102 without reducing the magnitude of the electromagnetic radiation pattern 400, 404 of the multi-patch antenna array 206 in other directions from the multi-patch antenna array 206. The apparatus 701 further comprises a first band pass filter 704 receiving the first signal 222 from the auxiliary antenna 214. Summing junction 706 combines signals 708 from each of the patch antenna elements 208 of the multi-patch antenna array 206 to form second signal 224. As previously described, each patch-antenna assembly 208 includes an X-direction feed 524 and a Y-direction feed 526. The phase shifter 710 shifts the signal from each Y-direction feed 526 by 90 degrees. The second band pass filter 712 receives the second signal 224 from the multi-patch antenna array 206. Similar to that described with reference to fig. 5, the multi-patch antenna array 206 is formed or mounted on the ground plane 512, and the auxiliary antenna 214 is also mounted on and extends from the ground plane 512.
The apparatus 701 also includes a local oscillator 714. A first output signal 716 from the first band pass filter 704 is mixed with a reference signal 718 from a local oscillator 714 in a mixer 720 to provide a first mixed signal 722. The second output signal 724 from the second band pass filter 712 is mixed with another reference signal 726 from the local oscillator 714 in another mixer 728 to provide a second mixed signal 730. A first analog-to-digital converter (ADC)732 samples or digitizes the first mixed signal 722 to generate a digitized first mixed signal 734, while a second ADC 736 digitizes the second mixed signal 730 to generate a digitized second mixed signal 738. Digital signal processor 740 combines digitized first mixed signal 734 and digitized second mixed signal 738 to provide spatial nulls 214 in direction 220 from multi-patch antenna array 206 to interfering antenna 102 (fig. 2). The output 742 from the digital signal processor 740 is fed to the second transceiver 114. Accordingly, the digital signal processor 740 combines the digitized first signal 222 from the auxiliary antenna 214 or the monopole antenna with the digitized combined second signal 224 from the multi-patch antenna array 206 to provide the spatial null 214 in the direction 220 from the multi-patch antenna array 206 to the interfering antenna 102. This is done by implementing a cancellation equation:
Stot＝AejΦ*Smono+Sarray
wherein Smono(S-sub-mono) and Sarray(S-sub-array) specifies the signal from the corresponding antenna, and A and Φ are applied to the first signal 222 or SmonoAmplitude adjustment and phaseThe factors are adjusted to provide cancellation similar to that previously described with reference to fig. 3. Stot(S-sub-tot) specifies the net signal after cancellation has been applied. According to an embodiment, the amplitude adjustment and the phase factor adjustment are determined by a calibration procedure with an interferer in the direction from the multi-patch antenna array 206 to the interfering antenna 102. In accordance with an example in which the second satellite communication system 116 is an iridium satellite communication system, the output 742 from the digital signal processor 740 will be in an iridium satellite signal format. However, the cancellation equations and processes described herein are applicable to any victim/interferer pair.
Fig. 8 is a flow diagram of an example of a method 800 for mitigating interference from neighboring antennas in accordance with an embodiment of the present disclosure. In block 802, a multi-patch antenna array is positioned relative to an interfering antenna such that an RF signal from the interfering antenna causes interference to a signal received by the multi-patch antenna array. An auxiliary antenna is positioned proximate to the multi-patch antenna array and between the multi-patch antenna and the interfering antenna for generating spatial nulls in a direction from the multi-patch antenna array to the interfering antenna. According to an embodiment, the auxiliary antenna is a monopole antenna positioned at least about one wavelength away from a center point of the multi-patch antenna array to avoid any electromagnetic coupling between the auxiliary antenna or the monopole antenna and the multi-patch antenna array.
In block 804, a first signal is received from an auxiliary antenna or a monopole antenna. The first signal is in response to a transmitted signal received by the auxiliary antenna. The transmit signal may be transmitted by an interfering antenna or another RF source.
In block 806, a second signal is received from the multi-patch antenna array. The multi-patch antenna array includes a plurality of patch antenna components. The second signal is responsive to the transmit signal received by the multi-patch antenna array. The first signal and the second signal are received by means for generating spatial nulls in a direction from the multi-patch antenna array to the interfering antenna.
In block 808, amplitude adjustments and phase factor adjustments are determined to provide cancellation of the RF transmit signal from the interfering antenna in a direction from the multi-patch antenna array to the interfering antenna. According to an embodiment, the amplitude adjustment and the phase factor adjustment are determined by a calibration procedure with an interferer in the direction from the multi-patch antenna array to the interfering antenna.
In block 810, the amplitude adjustment and the phase factor adjustment are applied to the first signal from the auxiliary antenna to provide a cancellation signal that generates a spatial null in a direction from the multi-patch antenna array to the interfering antenna. The spatial nulls are generated in a direction from the multi-patch antenna array to the interfering antenna in response to the first signal and the second signal. The first and second signals are generated in response to a transmit signal received through the auxiliary antenna and the multi-patch antenna array. The first signal from the auxiliary antenna is amplified to a predetermined magnitude to cancel the RF transmit signal in the direction of the interfering antenna without reducing the magnitude of the electromagnetic radiation pattern of the multi-patch antenna array in other directions from the multi-patch antenna array. The amplitude and phase factors of the first signal or signals from the auxiliary antenna are adjusted to cancel the electromagnetic radiation in the direction from the multi-patch antenna array to the interfering antenna, thereby producing spatial nulls in the electromagnetic radiation pattern of the multi-patch antenna array and auxiliary antenna combination, similar to that previously described with reference to fig. 4A and 4B. The spatial nulls allow the multi-patch antenna array and the interfering antenna to operate simultaneously.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of embodiments of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The corresponding structures, materials, acts, and equivalents of all means or step plus function elements in the claims below are intended to include any structure, material, or act for performing the function in combination with other claimed elements as specifically claimed. The description of the present embodiments has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the embodiments in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the embodiments.
Moreover, the present disclosure includes embodiments according to the following clauses:
clause 1. a system (202) for mitigating radio frequency "RF" interference from an adjacent antenna (204), the system comprising: a multi-patch antenna array (206, 504) comprising a plurality of patch antenna components (208, 506), the multi-patch antenna array being positioned relative to an interfering antenna such that an RF transmit signal (210) from the interfering antenna (102) causes interference (104) to a reception of an RF signal (212) by the multi-patch antenna array; an auxiliary antenna (214, 502) positioned relative to the multi-patch antenna array; and means (216, 701) for generating a spatial null (218, 402) in a direction (220) from the multi-patch antenna array to the interfering antenna in response to a first signal (222) from the auxiliary antenna and a second signal (224) from the multi-patch antenna array, the first and second signals being generated in response to transmit signals (210, 212, 226) received through the auxiliary antenna and the multi-patch antenna array, wherein the spatial null allows the multi-patch antenna array and the interfering antenna to operate simultaneously.
The system of clause 2. the system of clause 1, wherein the device is configured to determine an amplitude adjustment (318) and a phase factor adjustment (320) to provide cancellation of the RF transmit signal (210) from the interfering antenna in a direction from the multi-patch antenna array to the interfering antenna.
Clause 3. the system of clause 2, wherein the amplitude adjustment and the phase factor adjustment are applied to the first signal from the auxiliary antenna to provide a cancellation signal (314) that generates a spatial null in a direction from the multi-patch antenna array to the interfering antenna.
Clause 4. the system of clause 3, wherein the first signal from the auxiliary antenna is amplified to a predetermined magnitude to cancel the RF transmit signal in a direction from the multi-patch antenna array to the interfering antenna without reducing a magnitude of an electromagnetic radiation pattern (400, 404) of the multi-patch antenna array in other directions from the multi-patch antenna array.
Clause 5. the system of clause 1, wherein the auxiliary antenna (214, 502) comprises a monopole antenna.
Clause 6. the system of clause 5, wherein the monopole antenna is located approximately one wavelength from a center (215, 510) of the multi-patch antenna array.
Clause 7. the system of clause 5, wherein the height of the monopole antenna is selected such that a response (312) of the monopole antenna to a radiated electromagnetic field (227) from the interfering antenna approximately matches a response (306) of the multi-patch antenna array to the radiated electromagnetic field of the interfering antenna.
Clause 8. the system of clause 1, wherein the multi-patch antenna array includes at least two patch antenna components (208, 506).
Clause 9. the system of clause 1, wherein the multi-patch antenna array includes four patch antenna components (208, 506).
Clause 11. the system of clause 1, wherein each patch antenna element (506) is square and the multi-patch antenna array (504) provides circular polarization.
Clause 12. the system of clause 1, wherein the means (216, 701) for generating the spatial zero value comprises: a first band-pass filter (704) that receives the first signal from the auxiliary antenna; a summing junction (706) for combining signals (708) from each of the patch antenna elements (208, 506) of the multi-patch antenna array (206, 504) to form the second signal (224); a second band pass filter (712) that receives the second signal from the multi-patch antenna array; a local oscillator (714), wherein a first output signal (716) from the first band pass filter is mixed with a reference signal (718) from the local oscillator to provide a first mixed signal (722), and a second output signal (724) from the second band pass filter is mixed with another reference signal (726) from the local oscillator to provide a second mixed signal (730); a first analog-to-digital converter "ADC" (732) for digitizing the first mixed signal (722); a second ADC (736) for digitizing the second mixed signal (730); and a digital signal processor (740) that combines the digitized first mixed signal (734) and the digitized second mixed signal (738) to provide the spatial nulls in a direction from the patch antenna array to the interfering antenna.
Clause 13. the system of clause 1, wherein the interfering antenna transmits the RF transmit signal in a first frequency band and the multi-patch antenna array transmits and receives other RF transmit signals in a second frequency band adjacent to the first frequency band, no guard band between the first frequency band and the second frequency band.
Clause 14. a system (202) for mitigating radio frequency "RF" interference (104) from an adjacent antenna (204), the system comprising: a first transceiver (110) on a vehicle (118) configured for transmitting and receiving RF signals (210) over a first communication system (112) operating in a first frequency band; a jamming antenna (102) coupled to the first transceiver for transmitting and receiving the RF signal (210); a second transceiver (114) on a vehicle (118) configured to transmit and receive RF signals (212) over a second communication system (116) operating in a second frequency band adjacent to the first frequency band, and without guard frequencies between the first frequency band and the second frequency band; a multi-patch antenna array (206, 504) coupled to the second transceiver, the multi-patch antenna array including a plurality of patch antenna elements (208, 506), the multi-patch antenna array being positioned proximate to the interfering antenna such that an RF transmit signal from an interfering antenna interferes (104) with reception of the RF signal (212) by the multi-patch antenna array; an auxiliary antenna (214, 502) positioned between and proximate to the multi-patch antenna array and the interfering antenna; and means (216, 701) for generating a spatial null (218, 402) in a direction (220) from the multi-patch antenna array (206, 504) to the interfering antenna (102) in response to a first signal (222) from the auxiliary antenna (214) and a second signal (224) from the multi-patch antenna array (206, 504), the first and second signals being generated in response to transmitted signals (210, 212, 226) received through the auxiliary antenna and the multi-patch antenna array, wherein the spatial null allows the multi-patch antenna array and the interfering antenna to operate simultaneously.
Clause 15. the system of clause 14, wherein the apparatus is configured to determine an amplitude adjustment (318) and a phase factor adjustment (320) to provide cancellation of the RF transmit signal (210) from the interfering antenna in a direction from the multi-patch antenna array to the interfering antenna (102), the amplitude adjustment and the phase factor adjustment being applied to the first signal from the auxiliary antenna to provide a cancellation signal (314) that generates a spatial null in the direction from the multi-patch antenna array to the interfering antenna.
Clause 16. the system of clause 14, wherein the auxiliary antenna (214, 502) comprises a monopole antenna positioned about one wavelength from a center (215, 510) of the multi-patch antenna array.
Clause 17. the system of clause 16, wherein the height of the monopole antenna is selected such that a response (312) of the monopole antenna to a radiated electromagnetic field (227) from the interfering antenna approximately matches a response (306) of the multi-patch antenna array to the radiated electromagnetic field of the interfering antenna.
Clause 18. a method (800) for mitigating Radio Frequency (RF) interference from an adjacent antenna (204), the method comprising the steps of: receiving a first signal from an auxiliary antenna (214, 502); receiving a second signal from a multi-patch antenna array (206, 504); the multi-patch antenna array comprising a plurality of patch antenna components (208, 506), the multi-patch antenna array being positioned relative to an interfering antenna such that an RF transmit signal (210) from the interfering antenna (102) causes interference (104) to a reception of an RF signal (212) by the multi-patch antenna array; and generating (810) a spatial null (218, 402) in a direction (220) from the multi-patch antenna array (206, 504) to the interfering antenna in response to the first signal and the second signal, the first signal and the second signal being generated in response to transmit signals (210, 212, 226) received through the auxiliary antenna and the multi-patch antenna array, wherein the spatial null allows the multi-patch antenna array and the interfering antenna to operate simultaneously.
Clause 19. the method of clause 18, further comprising the steps of: determining (808) an amplitude adjustment (318) and a phase factor adjustment (320) to provide cancellation of the RF transmit signal from the interfering antenna in a direction from the multi-patch antenna array to the interfering antenna; and applying (810) the amplitude adjustment and the phase factor adjustment to the first signal from the auxiliary antenna to provide a cancellation signal (314) that generates a spatial null in a direction from the multi-patch antenna array to the interfering antenna.
Although specific embodiments have been illustrated and described herein, it will be appreciated by those of ordinary skill in the art that any arrangement which is calculated to achieve the same purpose may be substituted for the specific embodiments shown and that the embodiments have other applications in other environments. This application is intended to cover any adaptations or variations. The following claims are in no way intended to limit the scope of embodiments of the disclosure to the specific embodiments described herein.
Claims (13)
1. A system (202) for mitigating radio frequency, RF, interference from an adjacent antenna (204), the system comprising:
a multi-patch antenna array (206, 504) comprising a plurality of patch antenna components (208, 506), the multi-patch antenna array being positioned relative to an interfering antenna (102) such that an RF transmit signal (210) from the interfering antenna causes interference (104) to a reception of an RF signal (212) by the multi-patch antenna array;
an auxiliary antenna (214, 502) positioned relative to the multi-patch antenna array, wherein the auxiliary antenna (214, 502) comprises a monopole antenna, and wherein the monopole antenna is positioned between the multi-patch antenna array (206, 504) and the interfering antenna (102) and one wavelength from a center (215, 510) of the multi-patch antenna array; and
means (216, 701) for generating a spatial null (218, 402) in a direction (220) from the multi-patch antenna array to the interfering antenna in response to a first signal (222) from the auxiliary antenna and a second signal (224) from the multi-patch antenna array, the first and second signals being generated in response to a radiated electromagnetic field (227) from the interfering antenna (102) received by the auxiliary antenna and the multi-patch antenna array, wherein the spatial null allows the multi-patch antenna array and the interfering antenna to operate simultaneously.
2. The system of claim 1, wherein the apparatus is configured to determine an amplitude adjustment (318) and a phase factor adjustment (320) to provide cancellation of the RF transmit signal (210) from the interfering antenna in the direction from the multi-patch antenna array to the interfering antenna.
3. The system of claim 2, wherein the amplitude adjustment and the phase factor adjustment are applied to the first signal from the auxiliary antenna to provide a cancellation signal (314) that generates the spatial nulls in the direction from the multi-patch antenna array to the interfering antenna.
4. The system of claim 3, wherein the first signal from the auxiliary antenna is amplified to a predetermined magnitude to cancel the RF transmit signal in the direction from the multi-patch antenna array to the interfering antenna without reducing a magnitude of an electromagnetic radiation pattern (400, 404) of the multi-patch antenna array in other directions from the multi-patch antenna array.
5. The system of claim 1, wherein,
the height of the monopole antenna is selected such that a response (312) of the monopole antenna to a radiated electromagnetic field (227) from the interfering antenna matches a response (306) of the multi-patch antenna array to the radiated electromagnetic field of the interfering antenna.
6. The system of claim 1, wherein the multi-patch antenna array comprises at least two patch antenna components (208, 506).
7. The system of claim 1, wherein the multi-patch antenna array comprises four patch antenna components (208, 506), and wherein the patch antenna components (208, 506) are linearly positioned with respect to each other and the auxiliary antenna (502).
8. The system of claim 1, wherein each patch antenna assembly (506) is square, and wherein each patch antenna assembly includes an X-direction feed (524) and a Y-direction feed (526) formed in a patch such that the multi-patch antenna array (504) provides circular polarization.
9. The system of claim 1, wherein the means (216, 701) for generating the spatial zero values comprises:
a first band-pass filter (704) that receives the first signal from the auxiliary antenna;
a summing junction (706) for combining signals (708) from each of the patch antenna elements (208, 506) of the multi-patch antenna array (206, 504) to form the second signal (224);
a second band pass filter (712) that receives the second signal from the multi-patch antenna array;
a local oscillator (714), wherein a first output signal (716) from the first band pass filter is mixed with a reference signal (718) from the local oscillator to provide a first mixed signal (722), and a second output signal (724) from the second band pass filter is mixed with another reference signal (726) from the local oscillator to provide a second mixed signal (730);
a first analog-to-digital converter (732) for digitizing the first mixed signal (722);
a second analog-to-digital converter (736) for digitizing the second mixed signal (730); and
a digital signal processor (740) that combines the digitized first mixed signal (734) and the digitized second mixed signal (738) to provide the spatial nulls in the direction from the patch antenna array to the interfering antenna.
10. The system of claim 1, wherein the interfering antenna transmits the RF transmit signal in a first frequency band and the multi-patch antenna array transmits and receives other RF transmit signals in a second frequency band adjacent to the first frequency band, no guard band between the first and second frequency bands.
11. A method (800) for mitigating radio frequency, RF, interference from an adjacent antenna (204), the method comprising:
receiving (804) a first signal from an auxiliary antenna (214, 502), wherein the auxiliary antenna (214, 502) comprises a monopole antenna, and wherein the monopole antenna is positioned between a multi-patch antenna array (206, 504) and an interfering antenna (102) and one wavelength from a center (215, 510) of the multi-patch antenna array;
receiving (806) a second signal from the multi-patch antenna array (206, 504); the multi-patch antenna array comprising a plurality of patch antenna components (208, 506), the multi-patch antenna array being positioned relative to an interfering antenna (102) such that an RF transmit signal (210) from the interfering antenna causes interference (104) to a reception of an RF signal (212) by the multi-patch antenna array; and
generating spatial nulls (218, 402) in a direction (220) from the multi-patch antenna array (206, 504) to the interfering antenna in response to the first and second signals, the first and second signals being generated in response to a radiated electromagnetic field (227) from the interfering antenna (102) received through the auxiliary and multi-patch antenna arrays, wherein the spatial nulls allow the multi-patch antenna array and the interfering antenna to operate simultaneously.
12. The method of claim 11, further comprising the steps of:
determining (808) an amplitude adjustment (318) and a phase factor adjustment (320) to provide cancellation of the RF transmit signal from the interfering antenna in the direction from the multi-patch antenna array to the interfering antenna; and
applying the amplitude adjustment and the phase factor adjustment to the first signal from the auxiliary antenna to provide a cancellation signal that generates the spatial null in the direction from the multi-patch antenna array to the interfering antenna (314).
13. The method of claim 12, wherein the first signal from the auxiliary antenna is amplified to a predetermined magnitude to cancel the RF transmit signal in the direction of the interfering antenna without reducing a magnitude of an electromagnetic radiation pattern of the multi-patch antenna array in other directions from the multi-patch antenna array.
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| US15/384,954 US11011836B2 (en) | 2016-12-20 | 2016-12-20 | Adjacent antenna interference mitigation |
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| US9252868B1 (en) * | 2014-09-12 | 2016-02-02 | Iridium Satellite Llc | Wireless communication with interference mitigation |
| WO2016089464A1 (en) * | 2014-11-21 | 2016-06-09 | Raytheon Company | Compact wideband antenna structure with optics reflector as ground plane and associated methods for missile applications |
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| US20110148706A1 (en) * | 2009-12-18 | 2011-06-23 | Electronics And Telecommunications Research Institute | Antenna with controlled sidelobe characteristics |
| CN102104193B (en) * | 2010-12-01 | 2015-04-01 | 中兴通讯股份有限公司 | Multiple input multiple output antenna system |
| KR102117473B1 (en) | 2015-03-18 | 2020-06-01 | 삼성전기주식회사 | Mounting module, antenna apparatus and method for manufacturing mounting module |
| US9537210B2 (en) * | 2015-03-25 | 2017-01-03 | Intel IP Corporation | Antenna card for controlling and tuning antenna isolation to support carrier aggregation |
| US10616768B2 (en) * | 2016-06-05 | 2020-04-07 | Iridium Satellite Llc | Wireless communication with interference mitigation |
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| WO2016089464A1 (en) * | 2014-11-21 | 2016-06-09 | Raytheon Company | Compact wideband antenna structure with optics reflector as ground plane and associated methods for missile applications |
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